fixed toggle buttons being traversable (issue #38)

Author: kevincfisher

src/edu/millersville/cs/bitsplease/view/ToolbarButton.java

@@ -21,6 +21,7 @@ public ToolbarButton(){
 		addPersistentToggle();
 		setPrefWidth(40);
 		setPrefHeight(40);
+		setFocusTraversable(false);
 		setStyle("-fx-font-size: 16");
 	}